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https://www.readbyqxmd.com/read/28213253/sensitive-kinetic-catalytic-spectrophotometric-method-for-cobalt-determination-using-a-chip-coupled-to-a-multisyringe-flow-injection-analysis-system
#1
Fatima Zohra Abouhiat, Camelia Henríquez, Farida El Yousfi, Víctor Cerdà
The development of an automated kinetic-catalytic spectrophotometric method for cobalt determination is presented. The method is based on the catalytic effect of Co in the oxidation of hydroxybenzoic acid by H2O2 in basic media. The method has been automated using a multisyringe flow injection system coupled to a monolithic flow conduit called chip (chip-MSFIA). All reagents and sample are simultaneously propelled into the chip to achieve an efficient mixing. The reaction product is monitored at 482nm. The reaction takes place very fast at room temperature, thus the fixed-time method is applied to quantify Co concentration in samples...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28211166/clinical-relevance-of-pre-ovulatory-follicular-temperature-in-heat-stressed-lactating-dairy-cows
#2
F López-Gatius, Rhf Hunter
Temperature gradients in female reproductive tissues seem to influence the success of key processes such as ovulation and fertilization. The objective of this study was to investigate whether pre-ovulatory follicles are cooler than neighbouring uterine tissue and deep rectal temperatures in lactating dairy cows under heat stress conditions. Temperatures within the pre-ovulatory follicle, on the uterine adjacent surface and 20 cm deep within rectum, were measured using fine thermistor probes within 45 min after sunrise (dawn)...
February 17, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28196492/long-term-microfluidic-tracking-of-coccoid-cyanobacterial-cells-reveals-robust-control-of-division-timing
#3
Feiqiao Brian Yu, Lisa Willis, Rosanna Man Wah Chau, Alessandro Zambon, Mark Horowitz, Devaki Bhaya, Kerwyn Casey Huang, Stephen R Quake
BACKGROUND: Cyanobacteria are important agents in global carbon and nitrogen cycling and hold great promise for biotechnological applications. Model organisms such as Synechocystis sp. and Synechococcus sp. have advanced our understanding of photosynthetic capacity and circadian behavior, mostly using population-level measurements in which the behavior of individuals cannot be monitored. Synechocystis sp. cells are small and divide slowly, requiring long-term experiments to track single cells...
February 14, 2017: BMC Biology
https://www.readbyqxmd.com/read/28190929/databases-for-technical-aspects-of-immunohistochemistry
#4
Satoshi Furukawa, Mika Nagaike, Kiyokazu Ozaki
With the aims of sharing information about the technical aspects of immunohistochemistry (IHC) and making it possible to make a suitable choice of antibody for histopathological examination, this technical report describes the results of a questionnaire administered during the period of 2014 to 2015 to members of the Conference on Experimental Animal Histopathology. It also describes the immunological properties of primary antibodies (clone, supplier, catalog number, species reactivity, etc.) and the IHC staining conditions (fixing solution, fixing time, embedding, antigen retrieval method, antibody dilution, incubation time, incubation temperature, positive control tissue, secondary antibody information, etc...
January 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28186889/asynchronous-event-based-fourier-analysis
#5
Quentin Sabatier, Sio-Hoi Ieng, Ryad B Benosman
This paper introduces a method to compute the FFT of a visual scene at a high temporal precision of around 1 μs output from an asynchronous event-based camera. Event-based cameras allow to go beyond the widespread and ingrained belief that acquiring series of images at some rate is a good way to capture visual motion. Each pixel adapts its own sampling rate to the visual input it receives and defines the timing of its own sampling points in response to its visual input by reacting to changes of the amount of incident light...
February 6, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28166955/long-term-prostaglandin-based-protocols-improve-the-reproductive-performance-after-timed-artificial-insemination-in-sheep
#6
S Fierro, C Viñoles, J Olivera-Muzante
The aim of the experiment was to evaluate the reproductive performance of ewes synchronized with two doses of prostaglandin F2α (PG) at different intervals and inseminated at a fixed time. During the breeding season (April to June), 370 multiparous Corriedale ewes were assigned to five groups according to body condition score and body weight, and synchronized with two doses of PG administered 7, 10, 12, 14 or 16 days apart (groups PG7, PG10, PG12, PG14 or PG16; n = 73, 76, 74, 72, 75; respectively). Cervical timed artificial insemination (Day 0) was performed at 48 ± 1...
March 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28155060/fast-resorbable-antibiotic-loaded-hydrogel-coating-to-reduce-post-surgical-infection-after-internal-osteosynthesis-a-multicenter-randomized-controlled-trial
#7
Kostantinos Malizos, Michael Blauth, Adrian Danita, Nicola Capuano, Riccardo Mezzoprete, Nicola Logoluso, Lorenzo Drago, Carlo Luca Romanò
BACKGROUND: Infection is one of the main reasons for failure of orthopedic implants. Antibacterial coatings may prevent bacterial adhesion and biofilm formation, according to various preclinical studies. The aim of the present study is to report the first clinical trial on an antibiotic-loaded fast-resorbable hydrogel coating (Defensive Antibacterial Coating, DAC(®)) to prevent surgical site infection, in patients undergoing internal osteosynthesis for closed fractures. MATERIALS AND METHODS: In this multicenter randomized controlled prospective study, a total of 256 patients in five European orthopedic centers who were scheduled to receive osteosynthesis for a closed fracture, were randomly assigned to receive antibiotic-loaded DAC or to a control group (without coating)...
February 2, 2017: Journal of Orthopaedics and Traumatology: Official Journal of the Italian Society of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/28154793/predicting-overall-vaccine-efficacy-in-a-new-setting-by-re-calibrating-baseline-covariate-and-intermediate-response-endpoint-effect-modifiers-of-type-specific-vaccine-efficacy
#8
Peter B Gilbert, Ying Huang
We develop a transport formula for predicting overall cumulative vaccine efficacy through time t (VE(t)) to prevent clinically significant infection with a genetically diverse pathogen (e.g., HIV infection) in a new setting for which a Phase III preventive vaccine efficacy trial that would directly estimate VE(t) has not yet been conducted. The formula integrates data from (1) a previous Phase III trial, (2) a Phase I/II immune response biomarker endpoint trial in the new setting where a follow-up Phase III trial is planned, (3) epidemiological data on background HIV infection incidence in the new setting; and (4) genomic epidemiological data on HIV sequence distributions in the previous and new settings...
December 2016: Epidemiologic Methods
https://www.readbyqxmd.com/read/28148283/spatial-and-temporal-distribution-of-house-infestation-by-triatoma-infestans-in-the-toro-toro-municipality-potosi-bolivia
#9
Jorge Espinoza Echeverria, Antonio Nogales Rodriguez, Mirko Rojas Cortez, Liléia Gonçalves Diotaiuti, David E Gorla
BACKGROUND: Triatoma infestans is the main vector of Trypanosoma cruzi in Bolivia. The species is present both in domestic and peridomestic structures of rural areas, and in wild ecotopes of the Andean valleys and the Great Chaco. The identification of areas persistently showing low and high house infestation by the vector is important for the management of vector control programs. This study aimed at analyzing the temporal and spatial distribution of house infestation by T. infestans in the Toro Toro municipality (Potosi, Bolivia) between 2009 and 2014, and its association with environmental variables...
February 2, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28146017/profile-of-low-back-pain-treatment-and-costs-associated-with-patients-referred-to-orthopaedic-specialists-in-sweden
#10
Emma Jonsson, Gylfi Olafsson, Peter Fritzell, Olle Hägg, Fredrik Borgström
STUDY DESIGN: Analysis of Swedish national and regional register data. OBJECTIVES: The aim of this study was to characterize healthcare resource utilization, productivity loss, and costs of patients with low back pain (LBP) with or without leg pain, who have been referred from primary care settings to orthopedic specialist care. SUMMARY OF BACKGROUND DATA: Register data on outpatient and inpatient care, work absence, drug prescriptions, socioeconomics, and mortality were extracted for patients visiting orthopedic specialists for LBP in the Swedish region Västra Götaland (1...
January 31, 2017: Spine
https://www.readbyqxmd.com/read/28145857/cytotoxicity-study-of-benzo-a-pyrene-on-blood-cells-of-wistar-rat-in-vitro
#11
J Zhang, Y Liu, S-Z Wei
The effect of benzo[a]pyrene (BaP) on Wistar rat lymphocyte activity, lymphocyle membrane integrity and erythrocytes hemolysis were examined using the MTT assay, the release of the lactate dehydrogenase (LD) and the hemoglobin release respectively in vitro. The results showed that lymphocyte activity had no remarkable response to BaP after a low dose of exposure. But the membrane change was found after higher dose of BaP exposure, and the significant release of LD was observed. The release of LD increased with exposure time prolonging and exposure dose increasing...
December 30, 2016: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28121875/advanced-imaging-techniques-for-investigation-of-acellular-dermal-matrix-biointegration
#12
Brent R DeGeorge, Bo Ning, Lisa S Salopek, Angela Pineros-Fernandez, George T Rodeheaver, Shayn Peirce-Cottler, Song Hu, Patrick S Cottler, Christopher A Campbell
BACKGROUND: Biointegration, a concept involving a dynamic interplay among three processes-inflammation, cellular infiltration, and angiogenesis-is key to understanding the interaction between acellular dermal matrices and the host. The current standard for evaluating acellular dermal matrix biointegration involves histologic analysis at fixed time points; however, the authors' approach uses advanced imaging techniques to serially assess biointegration in real time. METHODS: The authors have adapted two advanced imaging techniques-two-photon microscopy and photoacoustic microscopy-to investigate biointegration in a murine deepithelialized dorsal skin-fold window chamber model, specifically engineered to recapitulate the host microenvironment of acellular dermal matrix-assisted breast reconstruction...
February 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28115608/partially-controlling-transient-chaos-in-the-lorenz-equations
#13
Rubén Capeáns, Juan Sabuco, Miguel A F Sanjuán, James A Yorke
Transient chaos is a characteristic behaviour in nonlinear dynamics where trajectories in a certain region of phase space behave chaotically for a while, before escaping to an external attractor. In some situations, the escapes are highly undesirable, so that it would be necessary to avoid such a situation. In this paper, we apply a control method known as partial control that allows one to prevent the escapes of the trajectories to the external attractors, keeping the trajectories in the chaotic region forever...
March 6, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28114053/finite-time-and-fixed-time-cluster-synchronization-with-or-without-pinning-control
#14
Xiwei Liu, Tianping Chen
In this paper, the finite-time and fixed-time cluster synchronization problem for complex networks with or without pinning control are discussed. Finite-time (or fixed-time) synchronization has been a hot topic in recent years, which means that the network can achieve synchronization in finite-time, and the settling time depends on the initial values for finite-time synchronization (or the settling time is bounded by a constant for any initial values for fixed-time synchronization). To realize the finite-time and fixed-time cluster synchronization, some simple distributed protocols with or without pinning control are designed and the effectiveness is rigorously proved...
December 6, 2016: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28110107/controller-design-for-global-fixed-time-synchronization-of-delayed-neural-networks-with-discontinuous-activations
#15
Leimin Wang, Zhigang Zeng, Junhao Hu, Xiaoping Wang
This paper addresses the controller design problem for global fixed-time synchronization of delayed neural networks (DNNs) with discontinuous activations. To solve this problem, adaptive control and state feedback control laws are designed. Then based on the two controllers and two lemmas, the error system is proved to be globally asymptotically stable and even fixed-time stable. Moreover, some sufficient and easy checked conditions are derived to guarantee the global synchronization of drive and response systems in fixed time...
December 23, 2016: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28107883/batch-medication-of-intestinal-infections-in-nursery-pigs-a-randomised-clinical-trial-on-the-efficacy-of-treatment-strategy-type-of-antibiotic-and-bacterial-load-on-average-daily-weight-gain
#16
Nicolai Rosager Weber, Ken Steen Pedersen, Christian Fink Hansen, Matthew Denwood, Charlotte Kristiane Hjulsager, Jens Peter Nielsen
INTRODUCTION: Previous research projects have demonstrated the need for better diagnostic tools to support decisions on medication strategies for infections caused by Escherichia coli F4 (F4) and F18 (F18), Lawsonia intracellularis (LI) and Brachyspira pilosicoli (PILO). This study was carried out as a randomised clinical trial in three Danish pig herds and included 1047 nursery pigs, distributed over 10 batches and 78 pens. The objectives of this study were: (1) to assess the effect of four 5-day treatment strategies (initiated at clinical outbreak of diarrhoea or at fixed time points 14, 21, or 28days after weaning) on average daily weight gain (ADG); (2) to compare the effect of treatment with doxycycline or tylosine on diarrhoea prevalence, pathogenic bacterial load, and ADG; (3) to evaluate PCR testing of faecal pen floor samples as a diagnostic tool for determining the optimal time of treatment...
February 1, 2017: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/28096623/estrus-induction-and-fertility-response-following-different-treatment-protocols-in-murrah-buffaloes-under-field-conditions
#17
L Kumar, J B Phogat, A K Pandey, S K Phulia, S Kumar, J Dalal
AIM: The aim of this study was to evaluate the efficacy of three different treatment protocols for estrus induction and conception rate in postpartum anestrus buffaloes during breeding season under field conditions. MATERIALS AND METHODS: The 47 postpartum anestrus buffaloes of the 2(nd) to 6(th) parity were divided into three groups. Group 1 (n=16): Buffaloes received cosynch treatment, that is, buserelin acetate 10 µg on day 0 and 9, cloprostenol 500 µg on day 7 followed by fixed-time artificial insemination (FTAI) at the time of second buserelin acetate and 24 h later...
December 2016: Veterinary World
https://www.readbyqxmd.com/read/28093626/contrast-enhanced-ct-in-determining-resectability-in-patients-with-pancreatic-carcinoma-a-meta-analysis-of-the-positive-predictive-values-of-ct
#18
Inne Somers, Shandra Bipat
OBJECTIVE: To obtain a summary positive predictive value (sPPV) of contrast-enhanced CT in determining resectability. METHODS: The MEDLINE and EMBASE databases from JAN2005 to DEC2015 were searched and checked for inclusion criteria. Data on study design, patient characteristics, imaging techniques, image evaluation, reference standard, time interval between CT and reference standard, and data on resectability/unresectablity were extracted by two reviewers. We used a fixed-effects or random-effects approach to obtain sPPV for resectability...
January 16, 2017: European Radiology
https://www.readbyqxmd.com/read/28057322/the-assessment-of-fetal-brain-growth-in-diabetic-pregnancy-using-in-utero-magnetic-resonance-imaging
#19
M Paddock, R Akram, D A Jarvis, P Armitage, S Song, P Madhuvrata, P D Griffiths
AIM: To assess fetal brain growth over the third trimester in pregnant women with diabetes using in utero magnetic resonance imaging (iuMRI) to determine if greater brain growth occurs in type 1 (T1DM) when compared to gestational (GDM) diabetes mellitus. MATERIALS AND METHODS: Each consented participant was scanned at three fixed times during the third trimester using iuMRI. One hundred and fifty-seven patients were approached, 48 participants were recruited, and 36 complete data sets were analysed...
January 3, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28042157/follicular-dynamics-and-ovulation-time-in-gilts-and-post-weaning-sows
#20
Sara I Williams, R Luzbel de la Sota
Ultrasonography was used to study follicular dynamics from the beginning of estrus to ovulation in pubertal gilts and post-weaning sows. Ultrasound turned out to be a useful tool to determine patterns of growth of preovulatory follicles, to predict ovulation time, and to design protocols for fixed time insemination.
January 2017: Canadian Veterinary Journal. la Revue Vétérinaire Canadienne
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